<template>
  <scroll-view
    @scrolltolower="getMore"
    scroll-y
    class="scroll-view"
    style="height: 100vh"
  >
    <!-- 已登录: 显示购物车 -->
    <template v-if="profile.id">
      <!-- 购物车列表 -->
      <view class="cart-list" v-if="cartList.length">
        <!-- 优惠提示 -->
        <view class="tips">
          <text class="label">满减</text>
          <text class="desc">满1件, 即可享受9折优惠</text>
        </view>
        <!-- 滑动操作分区 -->
        <uni-swipe-action>
          <!-- 滑动操作项 -->
          <uni-swipe-action-item
            v-for="item in cartList"
            :key="item.skuId"
            class="cart-swipe"
          >
            <!-- 商品信息 -->
            <view class="goods">
              <!-- 选中状态 -->
              <text
                @tap="changeSelectedItem(item)"
                class="checkbox"
                :class="{ checked: item.selected }"
              ></text>
              <navigator
                :url="`/pages/goods/goods?id=${item.id}`"
                hover-class="none"
                class="navigator"
              >
                <image
                  mode="aspectFill"
                  class="picture"
                  :src="item.picture"
                ></image>
                <view class="meta">
                  <view class="name ellipsis">
                    {{ item.name }}
                  </view>
                  <view class="attrsText ellipsis">{{ item.attrsText }}</view>
                  <view class="price">{{ item.price }}</view>
                </view>
              </navigator>
              <!-- 商品数量 -->
              <view class="count">
                <vk-data-input-number-box
                  v-model="item.count"
                  :min="1"
                  :max="item.stock"
                  @change="changeCount"
                  :index="item.skuId"
                ></vk-data-input-number-box>
              </view>
            </view>
            <!-- 右侧删除按钮 -->
            <template #right>
              <view class="cart-swipe-right">
                <button @tap="delCart(item.skuId)" class="button delete-button">
                  删除
                </button>
              </view>
            </template>
          </uni-swipe-action-item>
        </uni-swipe-action>
      </view>
      <!-- 购物车空状态 -->
      <view class="cart-blank" v-else>
        <image src="/static/images/blank_cart.png" class="image" />
        <text class="text">购物车还是空的，快来挑选好货吧</text>
        <navigator url="/pages/index/index" hover-class="none">
          <button class="button">去首页看看</button>
        </navigator>
      </view>
      <!-- 吸底工具栏 -->
      <view class="toolbar">
        <text
          @tap="changeSelectedAll"
          class="all"
          :class="{ checked: isSelectedAll }"
        >
          全选
        </text>
        <text class="text">合计:</text>
        <text class="amount">{{ selectedCartPrice }}</text>
        <view class="button-grounp">
          <view
            class="button payment-button"
            :class="{ disabled: selectedCartCount <= 0 }"
            @tap="toCreate"
          >
            去结算({{ selectedCartCount }})
          </view>
        </view>
      </view>
    </template>
    <!-- 未登录: 提示登录 -->
    <view class="login-blank" v-else>
      <text class="text">登录后可查看购物车中的商品</text>
      <navigator url="/pages/login/login" hover-class="none">
        <button class="button">去登录</button>
      </navigator>
    </view>
    <!-- 猜你喜欢 -->
    <XtxGuess ref="guessRef"></XtxGuess>
    <!-- 底部占位空盒子 -->
    <view class="toolbar-height"></view>
  </scroll-view>
</template>

<script>
import {
  deleteMemberCartAPI,
  getMemberCartAPI,
  putMemberCartBySkuIdAPI,
  putMemberCartSelectedAPI,
} from '@/services/cart'
import { userMixin } from '@/store/mixinVuex'
export default {
  mixins: [userMixin], // 自动引入profile属性，就是当前的用户信息
  created() {
    if (this.profile.id) {
      // this.getCartList()
      uni.$on('onShow', () => {
        this.getCartList()
      })
    }
  },
  data() {
    return {
      cartList: [],
    }
  },
  computed: {
    // 1、得到所有选中的商品
    selectedCartList() {
      return this.cartList.filter((item) => item.selected) // 得到选中的商品列表
    },
    // 2、获取选中的商品的数量
    selectedCartCount() {
      return this.selectedCartList.reduce((prev, current) => {
        return current.count + prev
      }, 0)
    },
    // 3、计算得到选中的商品的价格
    selectedCartPrice() {
      return this.selectedCartList.reduce((prev, current) => {
        return current.count * current.price + prev
      }, 0)
    },
    isSelectedAll: {
      get() {
        // every所有的列表项都满足条件的时候，才会返回true
        // 只要有一个不满足条件，会返回false
        return this.cartList.every((item) => item.selected)
      },
      set(newValue) {
        // newValue设置之后的新值
        // 所有的子项的状态都要同步修改
        this.cartList.forEach((item) => (item.selected = newValue))
      },
    },
  },
  methods: {
    toCreate() {
      if (this.selectedCartCount <= 0) {
        return uni.showToast({
          title: '请选择商品',
          icon: 'none',
        })
      }
      uni.navigateTo({ url: '/pagesOrder/create/create' })
    },
    // 计算属性默认不允许直接修改 ，this.x = x;
    changeSelectedAll() {
      // 点击了全选按钮的时候，需要做的事情
      // 1、调接口，服务器端把所有的商品的选中状态切换成我们传入的参数状态
      // 2、取反本地计算属性的状态。
      this.isSelectedAll = !this.isSelectedAll
      // 调用接口修改商品的状态
      putMemberCartSelectedAPI({ selected: this.isSelectedAll })
    },
    async changeSelectedItem(item) {
      // 1、当前这调数据的selected取反,界面能够正常切换
      item.selected = !item.selected
      // 2、提交接口，更新之后的结果提交给服务器
      putMemberCartBySkuIdAPI(item.skuId, { selected: item.selected })
    },
    async changeCount(e) {
      // 可以获取到切换之后的最新的数量，
      // 但是提交接口的时候，需要当前的skuId
      // 更新之后的最新数量同步给服务器
      await putMemberCartBySkuIdAPI(e.index, { count: e.value })
    },
    getMore() {
      // 父组件通过ref调用子组件获取更多数据的方法
      this.$refs.guessRef.getGuessList()
    },
    async getCartList() {
      const { result } = await getMemberCartAPI()
      this.cartList = result
    },
    async delCart(id) {
      // 删除之前也可以弹层确认
      // confirm如果为true，表示用户点击了确定
      const { confirm } = await uni.showModal({
        content: '是否确认删除',
      })
      if (!confirm) return
      await deleteMemberCartAPI({ ids: [id] })
      uni.showToast({
        title: '删除成功',
      })
      // 删除之后重新获取列表数据
      this.getCartList()
    },
  },
}
</script>

<style lang="scss">
// 根元素
:host {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: #f7f7f8;
}

// 滚动容器
.scroll-view {
  flex: 1;
}

// 购物车列表
.cart-list {
  padding: 0 20rpx;

  // 优惠提示
  .tips {
    display: flex;
    align-items: center;
    line-height: 1;
    margin: 30rpx 10rpx;
    font-size: 26rpx;
    color: #666;

    .label {
      color: #fff;
      padding: 7rpx 15rpx 5rpx;
      border-radius: 4rpx;
      font-size: 24rpx;
      background-color: #27ba9b;
      margin-right: 10rpx;
    }
  }

  // 购物车商品
  .goods {
    display: flex;
    padding: 20rpx 20rpx 20rpx 80rpx;
    border-radius: 10rpx;
    background-color: #fff;
    position: relative;

    .navigator {
      display: flex;
    }

    .checkbox {
      position: absolute;
      top: 0;
      left: 0;

      display: flex;
      align-items: center;
      justify-content: center;
      width: 80rpx;
      height: 100%;

      &::before {
        content: '\e6cd';
        font-family: 'erabbit' !important;
        font-size: 40rpx;
        color: #444;
      }

      &.checked::before {
        content: '\e6cc';
        color: #27ba9b;
      }
    }

    .picture {
      width: 170rpx;
      height: 170rpx;
    }

    .meta {
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      margin-left: 20rpx;
    }

    .name {
      height: 72rpx;
      font-size: 26rpx;
      color: #444;
    }

    .attrsText {
      line-height: 1.8;
      padding: 0 15rpx;
      font-size: 24rpx;
      align-self: flex-start;
      border-radius: 4rpx;
      color: #888;
      background-color: #f7f7f8;
    }

    .price {
      line-height: 1;
      font-size: 26rpx;
      color: #444;
      margin-bottom: 2rpx;
      color: #cf4444;

      &::before {
        content: '￥';
        font-size: 80%;
      }
    }

    // 商品数量
    .count {
      position: absolute;
      bottom: 20rpx;
      right: 5rpx;

      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 220rpx;
      height: 48rpx;

      .text {
        height: 100%;
        padding: 0 20rpx;
        font-size: 32rpx;
        color: #444;
      }

      .input {
        height: 100%;
        text-align: center;
        border-radius: 4rpx;
        font-size: 24rpx;
        color: #444;
        background-color: #f6f6f6;
      }
    }
  }

  .cart-swipe {
    display: block;
    margin: 20rpx 0;
  }

  .cart-swipe-right {
    display: flex;
    height: 100%;

    .button {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 50px;
      padding: 6px;
      line-height: 1.5;
      color: #fff;
      font-size: 26rpx;
      border-radius: 0;
    }

    .delete-button {
      background-color: #cf4444;
    }
  }
}

// 空状态
.cart-blank,
.login-blank {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 60vh;
  .image {
    width: 400rpx;
    height: 281rpx;
  }
  .text {
    color: #444;
    font-size: 26rpx;
    margin: 20rpx 0;
  }
  .button {
    width: 240rpx !important;
    height: 60rpx;
    line-height: 60rpx;
    margin-top: 20rpx;
    font-size: 26rpx;
    border-radius: 60rpx;
    color: #fff;
    background-color: #27ba9b;
  }
}

// 吸底工具栏
.toolbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: calc(var(--window-bottom));
  z-index: 1;

  height: 100rpx;
  padding: 0 20rpx;
  display: flex;
  align-items: center;
  border-top: 1rpx solid #ededed;
  border-bottom: 1rpx solid #ededed;
  background-color: #fff;

  .all {
    margin-left: 25rpx;
    font-size: 14px;
    color: #444;
    display: flex;
    align-items: center;
  }

  .all::before {
    font-family: 'erabbit' !important;
    content: '\e6cd';
    font-size: 40rpx;
    margin-right: 8rpx;
  }

  .checked::before {
    content: '\e6cc';
    color: #27ba9b;
  }

  .text {
    margin-right: 8rpx;
    margin-left: 32rpx;
    color: #444;
    font-size: 14px;
  }

  .amount {
    font-size: 20px;
    color: #cf4444;

    .decimal {
      font-size: 12px;
    }

    &::before {
      content: '￥';
      font-size: 12px;
    }
  }

  .button-grounp {
    position: absolute;
    right: 10rpx;
    top: 50%;

    display: flex;
    justify-content: space-between;
    text-align: center;
    line-height: 72rpx;
    font-size: 13px;
    color: #fff;
    transform: translateY(-50%);

    .button {
      width: 240rpx;
      margin: 0 10rpx;
      border-radius: 72rpx;
    }

    .payment-button {
      background-color: #27ba9b;

      &.disabled {
        opacity: 0.6;
      }
    }
  }
}
// 底部占位空盒子
.toolbar-height {
  height: 100rpx;
  box-sizing: content-box;
}
</style>
